Coaster-brake.



L. S. KALLAJIAN.

COASTER BRAKE.

APPLIUATION FILED 1330.3, 1909.

1,042,006. Patented 0015.22, 1912.

1.2i/ Qi Lazarus S.1/aUcy'ia/nj S. 'XILAJZLA'IL 0F BOSTON, MASSACHUSETTS.

fpeditionot- Letters Patent.

application nieaneembe'rfa 1909. serial No. 531,291.

To all whom it may :co/wcm:

Be it known that I,

the following is a specification.

hub, together with the braking means.; and

my invention has for its objects the electf ing of improvements in ,details .of construe-, tion which shall permit of the hub beingmade much smaller than ever before done, which enables an unbroken spindle to extend from end to end of .the hub and turn .rigidly withthe driving sprocket, causes the clutching"l and braking actions to be wvithout lost -motion, and provides .other advantages hereinafter set forth.

Referring to the drawings .forming partaccordance with my invention. Fig. 2 is a transverse section of the same .on the .dotted into proper contact with the cup 7, said cone beingv formed with a threaded. flange 8 screwing into said cup. Upon the periphery of said cup is screwed the sprocket 1, abutting against the shoulder 9 and secured thereon by the check-nut 10 which engages threads on a slightly reduced lportion 11- of said periphery which are opposite to the threads between said periphery and sprocket.v At the inner `face of said cup is a cone 12 pressing balls 13 into the cup 14 formed at the end of the hub 15, and integral with said cup 7 and cone 12 is the spindle 16 carrying the clutch and brake members, the opposite extremity of said spindle being formed with a cone 17 pressing balls 18 into the cup 19. Externally, said hub 15 is substantially like those in 'present use, being formed. with the cus- .LAzAnUs S. KALLA-L JIAN, a citizen of the United States, resid-z ing at the city of Boston, in the county of Suffolk and l(Lommonwealt-h .of llzlassachufl setts, Vhave invented certain new and usefull Improvements in -Coaster-Brakes, of which tomary anges20 from which radiate the wheel spokes to the wheel ri'm So long as the clutch devices are inactive, said hub and :wheel -rotate freely upon the balls and cones 13, 12 and 18, 17. 'llo cause the forcible rotation of the sprocket 1 to turn said hub and its wheel, the spindle 16 is formed with a number of cam grooves 21,

This invention relates to .that Class of1 coaster brakes wherein the clutch mecha. nism between the sprocket wheel .and driv` ing wheel is located within the latters .preferably three, (see Fig. 2) in each of which is a clutch roller 22. When the spindle is .turned in one direction, said rollers simply rotate freely in their grooves a ainst the radial faces of the latter: but t e moment the spindles direction is reversed, said rollers are forced against the surface of the'hub 15 and bind the same and the spindle rigidly together.

In the other half of the spindle are simi-l lar grooves 23 but opposite in clutching direction, in which are located rollers 24. The latter rollers differ from those` previously described simply in having each a deep annular groove at its midlength, in which Q grooves 25v rests a spring ring 26 norof this specification, Figure 1 1s a long-1-` tudinal section of a coaster brake made 'in` mally acting to keep the rollers within `their grooves or seats and out of engagement with the surface of the hub. Consequently, when .the sprocket and hub are turned for driving the bicycle, vthese rollers 23 are kept .from engagement with the surfaces surrounding the spindle, and also when said parts 1 and 16 are held stationary and the hub and its wheel allowed to rotate freely,

'as in coasting; but when it is desired to apply a braking action to said hub and wheel, `-.it is necesary to expand said spring ring 26 and s o permit the rollers 23 to engage both the inner surface of. the hub and at the' same time the inner surface of the stationary hood 27 composing a part of said cup 19. This is done by providing the hood 27 with teeth 28 located between the neighboring ends of such hood and the hub 15, .and .in the same plane with the spring ring 26; and forming said ring with one end pressed into engagement with said teeth, as shown in .Figa 3. The other end of said spring ring being made fast in said spindle 16, as by being bent inward therein, the moment the hub is given a slightv backward turn, said engaging end 29 is caught by one of said teeth and said spring ring expanded until the rollers 23 meet the surfaces of `both the hub and hood, are forced into Patented oet. 22,1912.

enough together to apply any desired degree ot braking action. Said hood 1s held rigid by'mcans of 'the lever arm 30, one endA of which tits upon a suitably non-circular boss 3l integral with the hood and cup, and the other enel of which is fastened to the bicycle frame.

inasmuch as it is inconvenient, if not practically impossible. to form the clutchgrooves in the spindle accurately .co-terminous with the clutch rollers, l retain said rollers in position longitudinally by means of thc 'rings'l sprung into the annular grooves 34; one of said grooves being shown at the right hand end of the spindle, where said ring is in section.

The view given in Fig. 1 1s supposed to be taken vfrom the front of the machine. Although I describe thiscoaster brake in the preceding specification as applied to a bicycle, it is equally well adapted for use in motorcycles.

Y The advantage in forming the end of the spindle with a cup 7, and the member 5 wlth a cone coacting therewith, instead of the reverse, is that thereby a smaller sprocket 1 can be used than would be the case were the cu and cone reversed.

at I claimas my invention and for which I desire Letters Patent is as follows, to wit;-

1. A coaster brake comprising a hub, a stationary hood concentric therewith,a spindle within said hub and hood, clutching lmeans' for rlocking said hub and spindletogether when the latter is turned forward, and clutching means for frictionally locking together said hood and spindle when the latter is turned rearward.

2. A coaster brake comprising a hollow hub, a stationary hood concentric therewith and ofequal inner diameter, a spindle within said hub and hood, clutching means for locking together said hub andspindle when the latter is turned lforward, and clutchin means for frictionally locking together said hub, hood and' spindle when the latter is ,turned backward.

3. A coaster brake comprising a hub, a stationary hood concentric therewith and having equal inner diameter, a sprocket and spindle, the latter located within said hub and hood and having clutch grooves longi-v tudinally extended in its periphery, clutch rollers in said grooves with their midlengths at the juncture of said hub and hood, and means for holding said rollers away from engagement with said hub and hood, said means being adapted to release said rollers when the spindle is turned backward.

4. A coaster brake comprising a hub, a stationary hood concentric therewith and having equal inner diameter, a sprocket' spindle located within said hub and hood Loaaoce having two sets of clutchv grooves therein, one set being opposite 1u irection to the other, clutch rollers located in said grooves,

one set of grooves and rollers being located with their mid-lengths at the juncture of therein, rollers located in said grooves with their mid-lengths at approxlmately the juncture of said hub' and hood, a spring ring normally holding said rollers away from engagement with said hub and hood, and means acting when the spindle is turned backward to expand said ring and permit Said-rollers to perform their clutching action between said s indle, hub and hood.

6. A coaster bra e comprisin a hub, a stationary hood, both concentric and of e ual diameters, a sprocket spindle located within the same, and having clutch grooves in its periphery, rollers ocated in said grooves with their mid-len hs at approximately the juncture of sai hub and hood, said hood being formed with teeth at such juncture, and a spring ring normally holding said rollers away rom engagement with said hubv and hood, one end of said spring being fastened to the spindle and the other adapted to engage said teeth when the spindleI is turned backward and to thereby expand said ring. c

7. A coaster brake comprising a hub, a`

outwardly, said hood being formed wit teeth at said juncture, and said spring lying in said annular grooves with its outer extremity engaging said teeth.

8. A coaster brake comprising a hub, a

stationary member, a sprocket spindle rotatable within the latter and extending unbroken through the same, clutching means uniting the hub and spindle when the latter is turned forward,- and friction clutching means engaging both said hub and stationary member when the spindle is given a backward turn.

9. A coaster brake comprisin a hub having a cup at one end, a spin le havin a cone, balls between the same, a sproc et tapped onto the periphery of said cone,` a

check-nut for the same, a cone having a threaded flange engaging the extended eriphery of the rst-named cone, the spin e being provided with a cup for the secondnamed cone, balls for the same, a stationary hood inclosed by the end of the hub opposite to its cup, said hood being formed with a cup, 'balls therein, the extremity of said spindle being formed into a cone engaging said balls, clutching means locking said hub and spindle when the latter is turned forward, and clutching means frictionally locking together said hood and I spindle when said spindle is turned rearward.

In testimony that I claim the foregoing invention, I have hereunto set my hand this 1st day of December, 1909.

LAZARUS S. KALLAJIAN.

Witnesses:

A. B. UPHAM, HENRY L. WHITTLESEY. 

